Initializing vectors
Vectors and Matrices are not initialized by default
You can initialize them when you define them
for example,
intVector A(10, 0); // 10 integers, all initially zero
charVector B(80, 'x'); // 80 characters, all initially 'x'
floatMatrix C(5, 6, 3.1415); // 5x6 matrix, all initially 3.1415
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